Source Sans Pro – Free Google Fonthttp://www.google.com/fonts/specimen/Source+Sans+ProFontAwesome – Free Web Icon Fonthttp://fontawesome.io/These can both be downloaded for free and used online as real text using the links provided.

All of the layers are well labelled and all buttons are contained within folders. All buttons are well organized and structured.

Creating new button combinations is simple using the FontAwesome icon font and the well labelled button backgrounds.